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latexrenewcommand

How can I redefine a starred LaTeX command that take parameters?

I am trying to redefine \chapter command like this

\let\oldchapter\chapter
\renewcommand\chapter[1]{{\color{green!30!blue!80}\oldchapter{#1}}}

These instructions were working before I start using the starred version \chapter*, but now I get compilation errors. I have searched a lot and found some guides (like this one) and answers but I can't get my code to work. Please tell me how I can edit this code to make it work, I have seen a lot of examples but I couldn't figure the right way to redefine starred commands.

Solution

  • Finally, I have found the solution from this old topic. My working code is now :

    \newcommand{\@chapterstar}[1]{{\color{green!30!blue!80}\oldchapter*{#1}}}
\newcommand{\@chapternostar}[1]{{\color{green!30!blue!80}\oldchapter{#1}}}
\renewcommand{\chapter}{\@ifstar{\@chapterstar}{\@chapternostar}}